Today, clear aligners are a normal part of dental care. Millions of patients have used them, and most dentists have been asked about them. But the idea is not very old. Here is how it began, and how it led to the digital workflows dentists and labs use today.

Before clear aligners

For most of the twentieth century, straightening teeth meant metal braces. Removable appliances existed too. One early example was the tooth positioner introduced by Dr. Harold Kesling in the 1940s, which helped finish tooth movement after braces. These were useful tools, but they were not a full, step-by-step way to move teeth using clear plastic trays designed on a computer.

The 1997 idea

The modern clear aligner story starts in the late 1990s in California. Align Technology was founded in 1997 by Zia Chishti and Kelsey Wirth, who had met as students at Stanford Graduate School of Business. Chishti had been an adult orthodontic patient, and the idea behind the company grew from that experience: what if a series of clear, removable trays, designed with 3D computer technology, could move teeth gradually?

The company’s approach was built on three things:

1. A digital model of the patient’s teeth
2. A planned series of small steps from the starting position to the goal
3. A set of custom-made clear aligners, one for each step

This idea changed how orthodontic care could be planned and delivered, because the whole treatment could be designed on a computer before the first aligner was made.

From idea to treatment

A few key milestones in the early years:

Year	Milestone
1997	Align Technology is founded
1998	The company receives US FDA clearance for the Invisalign system
2000	Invisalign is first marketed to the public
2001	Align Technology lists on the NASDAQ

In the years after, aligners moved from a new idea to a mainstream treatment. Other companies entered the market, dentists and orthodontists were trained to use the systems, and patients began asking for a discreet alternative to braces.

What changed for patients

Clear aligners made treatment feel different:

• Discreet: the trays are nearly invisible.
• Removable: patients can take them out to eat and to clean their teeth.
• Predictable planning: patients can often see a digital preview of the planned movement.
• Comfort: no metal brackets or wires.

These features helped aligners grow into one of the fastest growing areas of dentistry. To see how large the market has become, read our guide to the clear aligner market to 2030.

The digital workflow today

The core idea from 1997 is now spread across the whole industry, and the tools have improved a great deal. A typical case today follows a digital workflow:

1. An intraoral scan replaces messy impressions.
2. Planning software builds the setup and the steps. See our guide to the 6-step digital aligner workflow.
3. The dentist reviews and approves the plan.
4. 3D printing and production create the models and aligners.
5. Quality checks protect the case before it reaches the patient.

Because planning takes skill and time, many clinics and labs now work with specialist planning partners. If you are weighing that option, our guide on outsourcing clear aligner design compares the choices.

What comes next

Looking ahead, the industry is moving toward smarter planning tools, faster in-house production, hybrid care that combines in-person visits with remote monitoring and better visuals that help patients understand their treatment. The basic idea remains the same: plan the whole journey digitally, then move teeth in small, controlled steps.

How OrthoAlign Solution fits in

OrthoAlign Solution supports dentists, clinics and labs with digital aligner treatment planning, CAD/CAM design support, quality control and Meshmixer services. We do not replace the clinician’s judgment. We help you handle the digital work so you can spend more time on patients. Visit our services page or contact us to see how we can support your cases.

Frequently asked questions

Who started Align Technology? Align Technology was founded in 1997 by Zia Chishti and Kelsey Wirth.

When did Invisalign launch? It received US FDA clearance in 1998 and was first marketed in 2000.

Were clear aligners the first removable orthodontic appliances? No. Removable appliances such as tooth positioners existed earlier. The newer idea was a series of clear, computer-designed aligners that move teeth step by step.

How have aligners changed since then? Scanning, planning software, 3D printing and quality control have all improved, and many more providers now offer aligner treatment.

Do I need a specialist team to plan aligner cases? Not always, but many clinics find it saves time and adds a second check. Our guide to aligner QC explains what that looks like.